When Mac is telling the story about the killing of Toole from 30 years ago, the packet of $20 bills Toole looks through contains new design $20 bills.
When Mac draws his Glock while opening the door, you can tell by the trigger position that the gun is not cocked. Police officers normally carry their handguns cocked, and in any event, it is unlikely that a cop going into a potentially dangerous situation would neglect to cock his gun first.